[-debug-module-path] Prefer the moduleOutputInfo.output path if avail… #2024
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…able.
While testing the LLDB support for enhanced module tracking I noticed that the driver currently always uses a relative path for -debug-module-path, which is an obvious problem when compiling in a different directory, or if the swift module output is in a different path than the object file output. This patch addresses this by preferring moduleOutputInfo.output if available.
rdar://164524241
(Relanding #2012 with a relaxed test that doesn't encode the name of a temporary file)